Rotary engine and cooling systems thereof

A rotary engine, comprising:

• housings secured to one another, the housings including a first side housing, a second side housing, and a rotor housing clamped in sandwich between the first side housing and the second side housing, the rotor housing including a peripheral wall having a peripheral inner face and a peripheral outer face;
• a rotor rotationally received within a rotor cavity defined by the housings;
• and
• a parallel flow coolant circuit operable to individually cool the first side housing, the second side housing, and the rotor housing,
• the parallel flow coolant circuit having first, second, and third coolant passages extending respectively through the first side housing, the second side housing, and the rotor housing, the third coolant passage located between the peripheral inner face and the peripheral outer face, wherein the first, second, and third coolant passages are fluidly independent from one another.

A rotary engine, comprising:

• a stack of housings secured to one another and abutting one another at mounting interfaces, the housings including:
• a first side housing, a second side housing, an intermediate housing, a first rotor housing disposed between the first side housing and the intermediate housing, and a second rotor housing disposed between the intermediate housing and the second side housing, the first rotor housing including a peripheral wall having a peripheral inner face and a peripheral outer face;
• and
• rotors rotationally received within rotor cavities defined by the housings,
• the housings being cooled in parallel via respective coolant passages extending from respective inlets to respective outlets, the respective coolant passages free from intersection with the mounting interfaces, the mounting interfaces being free of a coolant seal, a coolant passage of the respective coolant passages extends between the peripheral inner face and the peripheral outer face of the first rotor housing.